I've compiled a list of features, in order of importance, required in another program to be able to port over my Fusion 360 designs. Some features have been grouped together and there are some additional features I wish Fusion had sprinked about. The grouped together features aren't in any particular order.

• Parameters / functions
• Components
• Sketches
  
  • Constraints
    • Coincident
    • Equal
    • Midpoint
    • Horz/vert
    • Tangent
    • Symmetry
    • Planar
    • Colinear
    • Parallel
    • Perpendicular
    • Lock
  • Dimension Tool
  • Profiles
  • Project / include
  • Redefine sketch plane
  • Offset
  • Text
  • Extend / trim
  • Polygon
  • Helix
• 3D / 2D Patterns
  • Circular
  • Rectangular
  • On path
• Joints
  • Rigid
  • As-built
  • Slider
  • Revolve
  • Rigid body 
• Extrude To
  • Revolve
  • Loft
  • Sweep 
• Chamfer / fillet
  • Variable
  • Different angle
  • Different lengths
• Mirror
• Combination
• Defeature
• Align
• Patch / thicken
• Scale
• Shell
• Version history
• Name features
• Groups
• Timeline
• Split body/face
• Measure distances
• Planes
  • Midplane
  • Tangent
• Appearance
• Selecting through faces
  • Section view
• Procedural move/rotate faces
  • Draft
  • Push-pull
• Threads
  • Modelled / textured
• Sheet Metal
• Emboss/cut onto curve
• Import/export
  • .step
  • .dxf
  • .svg
  • Image canvas
  • 3MF/STL

Whilst the list of features is long, it does make the problem feel a measurable amount more feasible to achieve.

 Looking at the development of Fornjot (video below), it seems that the timescale would be quite long to get to a desirable stage, thus I should continue modelling in Fusion 360 while I slowly work on this project on the side. I still think gd0096 would still be useful as a tool to plan designs before modelling it in CAD if it wasn't connected to a geometric kernel.